1.23% is the change from 811 to 821
Calculation steps:
[( 821 - 811 ) ÷ 811] x 100 = 1.23%
Formula
Percentage change = [(821 - 811) / 811] x 100
Subtract the new number by the original number
821 - 811 = 10
10 ÷ 811 = 0.012330456226880395
0.012330456226880395 x 100 = 1.23%